Show String outputs illegal escape sequence \& in string literals

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  • #293 来自 @JordanMartinez —— 已关闭,未合并

评估

难度
4/5
预计耗时
3-5 天
新手友好度
25/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
停滞
技术栈
haskell
领域
backend

调研方向

The issue describes a mismatch between REPL output and compiler input, but names no files or tests. Start by locating the string literal escape parser and the REPL string rendering code, then trace how numeric escapes are parsed. Done means the compiler accepts the zero-width escape used in REPL output; the issue gives no specific test command.

由索引模型根据 Issue 内容生成。

描述

purs-0.15 type: breaking change type: bug

Description

The REPL outputs string literals containing the escape sequence \& but this escape sequence is not accepted as input.

To Reproduce

In the REPL:

> "\x0000001"
"\0\&1"

> "\0\&1"
Illegal character escape code at line 1, column 3

Expected behavior

The REPL outputs valid string literals.

Additional context

Haskell supports \& to delimit a numeric escape sequence from the following characters, see The zero-width escape sequence. This is exactly the way in which the PureScript REPL uses \& to produce canonicalized string literals. However the compiler does not actually accept this escape sequence. If it did this would provide a solution to the problem in purescript/purescript#3750.

PureScript version

0.13.8

主要语言
PureScript
星标
168
派生
90
平均合并
3 天 1 小时
30 天内合并 PR
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